Re: [PATCH 1/9] drm/i915: Reference objects on the ww object list

On Tue, 8 Jun 2021 at 10:29, Thomas Hellström thomas.hellstrom@linux.intel.com wrote:

Since the ww transaction endpoint easily end up far out-of-scope of the objects on the ww object list, particularly for contending lock objects, make sure we reference objects on the list so they don't disappear under us.

This comes with a performance penalty so it's been debated whether this is really needed. But I think this is motivated by the fact that locking is typically difficult to get right, and whatever we can do to make it simpler for developers moving forward should be done, unless the performance impact is far too high.

Signed-off-by: Thomas Hellström thomas.hellstrom@linux.intel.com

Reviewed-by: Matthew Auld matthew.auld@intel.com